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Intel shows Russia fired into Ukraine

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The Ukrainian Prime Minister and his Cabinet resign but remain in place until elections

More than 400 people have died in eastern Ukraine fighting, government says

Planes carrying the remains of as many as 74 people land in Eindhoven

A rebel leader raises new uncertainty about how Flight 17 was shot down

The United States said Thursday it has proof that Russia is firing into Ukraine.

Also Thursday, Ukrainian Prime Minister Arseniy Yatsenyuk and his Cabinet announced their resignation in what Ukrainian political experts said was an expected development. Yatsenyuk and his Cabinet will remain in place as an acting government until elections in October.

The Ukrainian government has been battling pro-Russian rebels in eastern Ukraine. More than 400 people have died in the fighting, the government has said.

"We have new evidence that the Russians intend to deliver heavier and more powerful multiple rocket launchers to the separatist forces in Ukraine and have evidence that Russia is firing artillery from within Russia to attack Ukrainian military positions," said State Department spokeswoman Marie Harf.

Two U.S. officials said earlier that Russian troops have broken up into smaller groups and moved closer to the Ukrainian border.

Photos:MH17 victims' bodies transported

Photos:MH17 victims' bodies transported

MH17 victims' bodies transported – A line of hearses arrives at the Korporaal van Oudheusdenkazerne in Hilversum, Netherlands, on Saturday, July 26, as bodies from the crash of Malaysia Flight 17 are brought to the Netherlands where they will be identified. Flight 17 was shot down over Ukraine, killing all 298 people aboard. Of the people who died, 193 were Dutch citizens.

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Photos:MH17 victims' bodies transported

MH17 victims' bodies transported – Hearses carrying the coffins with the remains of the victims leave Eindhoven airbase on July 26

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Photos:MH17 victims' bodies transported

MH17 victims' bodies transported – Dutch military personnel carry coffins to a waiting hearse at the Eindhoven airbase on Friday, July 25.

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MH17 victims' bodies transported – An Australian military cargo plane, carrying some of the victims of Malaysia Airlines Flight 17, leaves Kharkiv, Ukraine, en route to the Netherlands on Friday, July 25.

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MH17 victims' bodies transported – People watch from a bridge in Boxtel, Netherlands, as hearses carry victims to Hilversum, Netherlands, on Thursday, July 24.

For the Dutch, a day of mourning

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MH17's quiet, abandoned crash site

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In the political realm, Yatsenyuk told Parliament that he was announcing his resignation after the blocking of government initiatives and the collapse of the coalition.

"At the moment my government does not have the answer" to numerous questions, including how to keep paying government salaries, military expenses and families of flight victims.

A "collapsed coalition has consequences," he said.

The Prime Minister's announcement comes as more bodies from Malaysia Airlines Flight 17 arrived in the Netherlands. The Boeing 777 was shot down by a suspected surface-to-air missile last week over eastern Ukraine, killing all 298 people on board.

Journalist working for CNN detained in Ukraine

Among other developments Thursday:

-- A Ukrainian journalist working as a freelancer for CNN has been detained by pro-Russian rebels.

Armed men from the self-declared Donetsk People's Republic seized Anton Skiba outside a hotel Tuesday in the rebel-controlled city of Donetsk.

An official with the self-declared Donetsk People's Republic initially accused Skiba of "terrorism" and of posting cash rewards for the killing of rebel fighters on his Facebook page. Later the official dropped the accusation about the Facebook posts and said Skiba was being questioned for having multiple forms of identification with different surnames.

On Wednesday, another high-ranking separatist official told CNN that Skiba admitted to being a "Ukrainian agent."

CNN initially chose not to report on Skiba's detention while making efforts to secure his release.

-- Planes bearing the dead from Flight 17 arrived in Netherlands for a second day.

Aircraft carrying the remains of as many as 74 people touched down Thursday at a military base in Eindhoven. Forty wooden caskets were flown in Wednesday and greeted by somber, moving tributes across the country.

Of the citizens from 10 countries who died on Flight 17, the majority, 193, were Dutch.

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Does debris prove MH17 was shot down?

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Will victims' families ever get justice?

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Will victims' families ever get justice?03:07

Photos:Photos: Reaction to MH17

Photos:Photos: Reaction to MH17

World reacts to MH17 crash – Families of crew members aboard Malaysia Airlines Flight 17 gather for a vigil Tuesday, July 22, in Kuala Lumpur, Malaysia. All 298 people aboard the passenger plane died when it was shot down Thursday, July 17, in a rebel-controlled part of eastern Ukraine.

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Photos:Photos: Reaction to MH17

World reacts to MH17 crash – A woman cries July 22 during a service near the crash site.

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Photos:Photos: Reaction to MH17

World reacts to MH17 crash – People in Melbourne gather to mourn the victims during a candlelight vigil at Federation Square on July 22.

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World reacts to MH17 crash – In memory of two Newcastle United fans who died in the crash, two wreaths are placed on seats July 22 at the Forsyth Barr Stadium in Dunedin, New Zealand. The soccer fans were traveling to New Zealand to watch their team play in a preseason tournament.

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World reacts to MH17 crash – A KLM employee reaches out into a sea of flowers July 22 at Schiphol Airport in Amsterdam, Netherlands.

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World reacts to MH17 crash – A flower and stuffed animal sit near the crash site on Monday, July 21.

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World reacts to MH17 crash – A woman in Kuala Lumpur attends a candlelight vigil on July 21.

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Photos:Photos: Reaction to MH17

World reacts to MH17 crash – Ukrainian President Petro Poroshenko attends a flower-laying ceremony at the Dutch Embassy in Kiev, Ukraine, on July 21. Although the passengers came from all over the world, many of them were Dutch because the flight originated in Amsterdam.

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Photos:Photos: Reaction to MH17

World reacts to MH17 crash – A woman places a flower during a candlelight vigil in Kuala Lumpur on July 21.

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Photos:Photos: Reaction to MH17

World reacts to MH17 crash – Mourners in Eynesbury, Australia, attend a memorial service Sunday, July 20, for a family of five killed in the disaster.

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Photos:Photos: Reaction to MH17

World reacts to MH17 crash – Buddhist monks in the Malaysian capital light candles during a special prayer for the victims on July 20.

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Photos:Photos: Reaction to MH17

World reacts to MH17 crash – Wildflowers lie on an engine from the crashed jet on Saturday, July 19.

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Photos:Photos: Reaction to MH17

World reacts to MH17 crash – Friends of Nur Shazana Mohamed, a crew member aboard the flight, take part in a special remembrance prayer at a mosque in Putrajaya, Malaysia, on July 19.

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Photos:Photos: Reaction to MH17

World reacts to MH17 crash – Dutch Prime Minister Mark Rutte signs a condolence register at the Ministry of Safety and Justice in The Hague, Netherlands, on Friday, July 18. "I want to see results in the form of unimpeded access and rapid recovery," Rutte said in a press briefing. "This is now priority number one."

World reacts to MH17 crash – A woman in Berlin places a candle at a memorial on July 18.

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Photos:Photos: Reaction to MH17

World reacts to MH17 crash – People in Kiev gather to mourn the victims on July 18.

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Photos:Photos: Reaction to MH17

World reacts to MH17 crash – Akmar Binti Mohd Noor, whose sister was aboard Flight 17, cries outside the family holding area at Kuala Lumpur International Airport on July 18.

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World reacts to MH17 crash – A man prays at a memorial in front of the Dutch Embassy in Kiev on July 18.

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World reacts to MH17 crash – Dutch cyclists wear a black armband in honor of the crash victims during the 13th stage of the Tour de France on July 18.

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World reacts to MH17 crash – Dutch Justice Minister Ivo Opstelten observes a moment of silence after signing a condolence book in The Hague on July 18.

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World reacts to MH17 crash – Candlelight prayers honor the victims at a church outside Kuala Lumpur on July 18.

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World reacts to MH17 crash – Floral tributes adorn the entrance to Schiphol Airport in Amsterdam.

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World reacts to MH17 crash – A Dutch flag flies at half-staff in The Hague on July 18.

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World reacts to MH17 crash – People place flowers in front of the Dutch Embassy in Moscow on July 18.

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World reacts to MH17 crash – Students attend a prayer July 18 in Central Java, Indonesia. Their teacher John Paulissen was a passenger on Flight 17.

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World reacts to MH17 crash – Russian President Vladimir Putin, center, and members of his government observe a moment of silence on Thursday, July 17.

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World reacts to MH17 crash – People pay tribute to the victims outside the Dutch Embassy in Kiev on July 17.

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The voice and flight data recorders are now in Britain for what will be a detailed scouring by international analysts that could take weeks. On Wednesday, investigators found that the cockpit voice recorder was damaged, but its memory was intact. There was no sign of tampering.

But Dutch crash investigators leading the inquiry said Wednesday they still don't have everything they need and haven't been able to visit the crash site under safe conditions to carry out their work.

Australia has sent 50 police officials to London in advance of their joining a possible international deployment to eastern Ukraine to secure the crash site, Prime Minister Tony Abbott said Thursday.

Did rebels have missile system?

Accusations continue to fly over who was responsible for shooting down Flight 17.

One pro-Russian rebel commander further complicated the picture by appearing to acknowledge that rebels had in their possession the type of surface-to-air missile system that U.S. officials say was used to bring down Flight 17.

Since the crash a week ago, rebel leaders have repeatedly denied that they had an SA-11, or Buk, missile system, at their disposal.

But in an interview with the news agency Reuters, Alexander Khodakovsky, the commander of the Vostok Battalion in Donetsk, said he knew about the missile system.

"I knew that a BUK came from Luhansk. At the time I was told that a BUK was coming from Luhansk under the flag of the LNR," Khodakovsky told Reuters, making a reference to the Luhansk People's Republic, the principal rebel group in Luhansk.

Luhansk is one of two rebel provinces in eastern Ukraine. The other, Donetsk, is where Flight 17 came down.

"I found out about it when I found out that this tragedy happened. Most likely it was brought back in order to conceal the evidence of its presence," Khodakovsky said in the Reuters interview, which took place Tuesday and was published Wednesday.

He accused the Ukrainian government of provoking "usage of this kind of weapon against a plane with civilians which was flying by."

But Russian media later reported that Khodakovsky later denied that he confirmed that rebels had the missile system, saying his comments were taken out of context. He told the news outlet RT that he was only discussing theories with Reuters and that he did not have information on such a weapon. Reuters said it is sticking by its story.